Firmware update on PC, then back to Mac??

Hi
I have an old iMac G5 & suddenly the new Firmware wont update my iPhone (The new iTunes wont run on my old machine as its not running Snow Leopard)
I was thinking I could hard reset the phone & wipe everything off.
Then I would update my iPhone's firmware on a PC.
Would I be able to resync it with my Mac again after doing firmware upgrade on a PC & put my music etc back on?
Is there another way around this to get the latest firmware without upgrading my OS?
Thanks

"Would I be able to resync it with my Mac again after doing firmware upgrade on a PC & put my music etc back on?"
No. Ios 4.2.1 requires itunes 10.1 which requires Mac os 10.5.8. An iphone running ios 4.2.1 will not work with anything less.
Is there another way around this to get the latest firmware without upgrading my OS?"
No.

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